comparison hgext/lfs/blobstore.py @ 43076:2372284d9457

formatting: blacken the codebase

This is using my patch to black
(https://github.com/psf/black/pull/826) so we don't un-wrap collection
literals.

Done with:

  hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**"' | xargs black -S

# skip-blame mass-reformatting only

# no-check-commit reformats foo_bar functions

Differential Revision: https://phab.mercurial-scm.org/D6971

43075:57875cf423c9

    util,
    vfs as vfsmod,
    worker,
)

from mercurial.utils import (
    stringutil,
)

from ..largefiles import lfutil

# 64 bytes for SHA256
_lfsre = re.compile(br'\A[a-f0-9]{64}\Z')

class lfsvfs(vfsmod.vfs):
    def join(self, path):
        """split the path at first two characters, like: XX/XXXXX..."""
        if not _lfsre.match(path):

        # when dirpath == root, dirpath[prefixlen:] becomes empty
        # because len(dirpath) < prefixlen.
        prefixlen = len(pathutil.normasprefix(root))
        oids = []

        for dirpath, dirs, files in os.walk(self.reljoin(self.base, path
                                                         or b''),
                                            onerror=onerror):
            dirpath = dirpath[prefixlen:]

            # Silently skip unexpected files and directories
            if len(dirpath) == 2:
                oids.extend([dirpath + f for f in files
                             if _lfsre.match(dirpath + f)])

        yield ('', [], oids)

class nullvfs(lfsvfs):
    def __init__(self):
        pass

    def read(self, oid):
        # store.read() calls into here if the blob doesn't exist in its
        # self.vfs.  Raise the same error as a normal vfs when asked to read a
        # file that doesn't exist.  The only difference is the full file path
        # isn't available in the error.
        raise IOError(errno.ENOENT,
                      pycompat.sysstr(b'%s: No such file or directory' % oid))

    def walk(self, path=None, onerror=None):
        return (b'', [], [])

    def write(self, oid, data):
        pass

class filewithprogress(object):
    """a file-like object that supports __len__ and read.

    Useful to provide progress information for how many bytes are read.
    """

    def __init__(self, fp, callback):
        self._fp = fp
        self._callback = callback # func(readsize)
        fp.seek(0, os.SEEK_END)
        self._len = fp.tell()
        fp.seek(0)

    def __len__(self):

        else:
            self._fp.close()
            self._fp = None
        return data

class local(object):
    """Local blobstore for large file contents.

    This blobstore is used both as a cache and as a staging area for large blobs
    to be uploaded to the remote blobstore.

                fp.write(chunk)
                sha256.update(chunk)

            realoid = node.hex(sha256.digest())
            if realoid != oid:
                raise LfsCorruptionError(_(b'corrupt remote lfs object: %s')
                                         % oid)

        self._linktousercache(oid)

    def write(self, oid, data):
        """Write blob to local blobstore.

        upload the blob, to ensure it is always available in this store.
        Normally this is done implicitly when the client reads or writes the
        blob, but that doesn't happen when the server tells the client that it
        already has the blob.
        """
        if (not isinstance(self.cachevfs, nullvfs)
            and not self.vfs.exists(oid)):
            self.ui.note(_(b'lfs: found %s in the usercache\n') % oid)
            lfutil.link(self.cachevfs.join(oid), self.vfs.join(oid))

    def _linktousercache(self, oid):
        # XXX: should we verify the content of the cache, and hardlink back to
        # the local store on success, but truncate, write and link on failure?
        if (not self.cachevfs.exists(oid)
            and not isinstance(self.cachevfs, nullvfs)):
            self.ui.note(_(b'lfs: adding %s to the usercache\n') % oid)
            lfutil.link(self.vfs.join(oid), self.cachevfs.join(oid))

    def read(self, oid, verify=True):
        """Read blob from local blobstore."""

    def has(self, oid):
        """Returns True if the local blobstore contains the requested blob,
        False otherwise."""
        return self.cachevfs.exists(oid) or self.vfs.exists(oid)

def _urlerrorreason(urlerror):
    '''Create a friendly message for the given URLError to be used in an
    LfsRemoteError message.
    '''
    inst = urlerror

    if isinstance(urlerror.reason, Exception):
        inst = urlerror.reason

    if util.safehasattr(inst, 'reason'):
        try: # usually it is in the form (errno, strerror)
            reason = inst.reason.args[1]
        except (AttributeError, IndexError):
            # it might be anything, for example a string
            reason = inst.reason
        if isinstance(reason, pycompat.unicode):

    elif getattr(inst, "strerror", None):
        return encoding.strtolocal(inst.strerror)
    else:
        return stringutil.forcebytestr(urlerror)

class lfsauthhandler(util.urlreq.basehandler):
    handler_order = 480  # Before HTTPDigestAuthHandler (== 490)

    def http_error_401(self, req, fp, code, msg, headers):
        """Enforces that any authentication performed is HTTP Basic

        if authreq:
            scheme = authreq.split()[0]

            if scheme.lower() != r'basic':
                msg = _(b'the server must support Basic Authentication')
                raise util.urlerr.httperror(req.get_full_url(), code,
                                            encoding.strfromlocal(msg), headers,
                                            fp)
        return None

class _gitlfsremote(object):

    def __init__(self, repo, url):
        ui = repo.ui
        self.ui = ui
        baseurl, authinfo = url.authinfo()
        self.baseurl = baseurl.rstrip(b'/')

        """Get metadata about objects pointed by pointers for given action

        Return decoded JSON object like {'objects': [{'oid': '', 'size': 1}]}
        See https://github.com/git-lfs/git-lfs/blob/master/docs/api/batch.md
        """
        objects = [{r'oid': pycompat.strurl(p.oid()),
                    r'size': p.size()} for p in pointers]
        requestdata = pycompat.bytesurl(json.dumps({
            r'objects': objects,
            r'operation': pycompat.strurl(action),
        }))
        url = b'%s/objects/batch' % self.baseurl
        batchreq = util.urlreq.request(pycompat.strurl(url), data=requestdata)
        batchreq.add_header(r'Accept', r'application/vnd.git-lfs+json')
        batchreq.add_header(r'Content-Type', r'application/vnd.git-lfs+json')
        try:
            with contextlib.closing(self.urlopener.open(batchreq)) as rsp:
                rawjson = rsp.read()
        except util.urlerr.httperror as ex:
            hints = {
                400: _(b'check that lfs serving is enabled on %s and "%s" is '
                       b'supported') % (self.baseurl, action),
                404: _(b'the "lfs.url" config may be used to override %s')
                       % self.baseurl,
            }
            hint = hints.get(ex.code, _(b'api=%s, action=%s') % (url, action))
            raise LfsRemoteError(
                _(b'LFS HTTP error: %s') % stringutil.forcebytestr(ex),
                hint=hint)
        except util.urlerr.urlerror as ex:
            hint = (_(b'the "lfs.url" config may be used to override %s')
                    % self.baseurl)
            raise LfsRemoteError(_(b'LFS error: %s') % _urlerrorreason(ex),
                                 hint=hint)
        try:
            response = json.loads(rawjson)
        except ValueError:
            raise LfsRemoteError(_(b'LFS server returns invalid JSON: %s')
                                 % rawjson.encode("utf-8"))

        if self.ui.debugflag:
            self.ui.debug(b'Status: %d\n' % rsp.status)
            # lfs-test-server and hg serve return headers in different order
            headers = pycompat.bytestr(rsp.info()).strip()
            self.ui.debug(b'%s\n'
                          % b'\n'.join(sorted(headers.splitlines())))

            if r'objects' in response:
                response[r'objects'] = sorted(response[r'objects'],
                                              key=lambda p: p[r'oid'])
            self.ui.debug(b'%s\n'
                          % pycompat.bytesurl(
                              json.dumps(response, indent=2,
                                         separators=(r'', r': '),
                                         sort_keys=True)))

        def encodestr(x):
            if isinstance(x, pycompat.unicode):
                return x.encode(u'utf-8')
            return x

            # The server should return 404 when objects cannot be found. Some
            # server implementation (ex. lfs-test-server)  does not set "error"
            # but just removes "download" from "actions". Treat that case
            # as the same as 404 error.
            if b'error' not in response:
                if (action == b'download'
                    and action not in response.get(b'actions', [])):
                    code = 404
                else:
                    continue
            else:
                # An error dict without a code doesn't make much sense, so

                    410: b'The object was removed by the owner',
                    422: b'Validation error',
                    500: b'Internal server error',
                }
                msg = errors.get(code, b'status code %d' % code)
                raise LfsRemoteError(_(b'LFS server error for "%s": %s')
                                     % (filename, msg))
            else:
                raise LfsRemoteError(
                    _(b'LFS server error. Unsolicited response for oid %s')
                    % response[b'oid'])

    def _extractobjects(self, response, pointers, action):
        """extract objects from response of the batch API

        response: parsed JSON object returned by batch API

        objects = response.get(b'objects', [])
        self._checkforservererror(pointers, objects, action)

        # Filter objects with given action. Practically, this skips uploading
        # objects which exist in the server.
        filteredobjects = [o for o in objects
                           if action in o.get(b'actions', [])]

        return filteredobjects

    def _basictransfer(self, obj, action, localstore):
        """Download or upload a single object using basic transfer protocol

        request = util.urlreq.request(pycompat.strurl(href))
        if action == b'upload':
            # If uploading blobs, read data from local blobstore.
            if not localstore.verify(oid):
                raise error.Abort(_(b'detected corrupt lfs object: %s') % oid,
                                  hint=_(b'run hg verify'))
            request.data = filewithprogress(localstore.open(oid), None)
            request.get_method = lambda: r'PUT'
            request.add_header(r'Content-Type', r'application/octet-stream')
            request.add_header(r'Content-Length', len(request.data))

                if self.ui.debugflag:
                    ui.debug(b'Status: %d\n' % req.status)
                    # lfs-test-server and hg serve return headers in different
                    # order
                    headers = pycompat.bytestr(req.info()).strip()
                    ui.debug(b'%s\n'
                             % b'\n'.join(sorted(headers.splitlines())))

                if action == b'download':
                    # If downloading blobs, store downloaded data to local
                    # blobstore
                    localstore.download(oid, req)

                        response += data
                    if response:
                        ui.debug(b'lfs %s response: %s' % (action, response))
        except util.urlerr.httperror as ex:
            if self.ui.debugflag:
                self.ui.debug(b'%s: %s\n' % (oid, ex.read())) # XXX: also bytes?
            raise LfsRemoteError(_(b'LFS HTTP error: %s (oid=%s, action=%s)')
                                 % (stringutil.forcebytestr(ex), oid, action))
        except util.urlerr.urlerror as ex:
            hint = (_(b'attempted connection to %s')
                    % pycompat.bytesurl(util.urllibcompat.getfullurl(request)))
            raise LfsRemoteError(_(b'LFS error: %s') % _urlerrorreason(ex),
                                 hint=hint)

    def _batch(self, pointers, localstore, action):
        if action not in [b'upload', b'download']:
            raise error.ProgrammingError(b'invalid Git-LFS action: %s' % action)

        objects = self._extractobjects(response, pointers, action)
        total = sum(x.get(b'size', 0) for x in objects)
        sizes = {}
        for obj in objects:
            sizes[obj.get(b'oid')] = obj.get(b'size', 0)
        topic = {b'upload': _(b'lfs uploading'),
                 b'download': _(b'lfs downloading')}[action]
        if len(objects) > 1:
            self.ui.note(_(b'lfs: need to transfer %d objects (%s)\n')
                         % (len(objects), util.bytecount(total)))

        def transfer(chunk):
            for obj in chunk:
                objsize = obj.get(b'size', 0)
                if self.ui.verbose:
                    if action == b'download':
                        msg = _(b'lfs: downloading %s (%s)\n')
                    elif action == b'upload':
                        msg = _(b'lfs: uploading %s (%s)\n')
                    self.ui.note(msg % (obj.get(b'oid'),
                                 util.bytecount(objsize)))
                retry = self.retry
                while True:
                    try:
                        self._basictransfer(obj, action, localstore)
                        yield 1, obj.get(b'oid')
                        break
                    except socket.error as ex:
                        if retry > 0:
                            self.ui.note(
                                _(b'lfs: failed: %r (remaining retry %d)\n')
                                % (stringutil.forcebytestr(ex), retry))
                            retry -= 1
                            continue
                        raise

        # Until https multiplexing gets sorted out
        if self.ui.configbool(b'experimental', b'lfs.worker-enable'):
            oids = worker.worker(self.ui, 0.1, transfer, (),
                                 sorted(objects, key=lambda o: o.get(b'oid')))
        else:
            oids = transfer(sorted(objects, key=lambda o: o.get(b'oid')))

        with self.ui.makeprogress(topic, total=total) as progress:
            progress.update(0)

                progress.update(processed)
                self.ui.note(_(b'lfs: processed: %s\n') % oid)

        if blobs > 0:
            if action == b'upload':
                self.ui.status(_(b'lfs: uploaded %d files (%s)\n')
                               % (blobs, util.bytecount(processed)))
            elif action == b'download':
                self.ui.status(_(b'lfs: downloaded %d files (%s)\n')
                               % (blobs, util.bytecount(processed)))

    def __del__(self):
        # copied from mercurial/httppeer.py
        urlopener = getattr(self, 'urlopener', None)
        if urlopener:
            for h in urlopener.handlers:
                h.close()
                getattr(h, "close_all", lambda : None)()

class _dummyremote(object):
    """Dummy store storing blobs to temp directory."""

    def __init__(self, repo, url):

    def readbatch(self, pointers, tostore):
        for p in _deduplicate(pointers):
            with self.vfs(p.oid(), b'rb') as fp:
                tostore.download(p.oid(), fp)

class _nullremote(object):
    """Null store storing blobs to /dev/null."""

    def __init__(self, repo, url):
        pass

        pass

    def readbatch(self, pointers, tostore):
        pass

class _promptremote(object):
    """Prompt user to set lfs.url when accessed."""

    def __init__(self, repo, url):
        pass

    def readbatch(self, pointers, tostore, ui=None):
        self._prompt()

    def _prompt(self):
        raise error.Abort(_(b'lfs.url needs to be configured'))

_storemap = {
    b'https': _gitlfsremote,
    b'http': _gitlfsremote,
    b'file': _dummyremote,
    b'null': _nullremote,
    None: _promptremote,
}

def _deduplicate(pointers):
    """Remove any duplicate oids that exist in the list"""
    reduced = util.sortdict()
    for p in pointers:
        reduced[p.oid()] = p
    return reduced.values()

def _verify(oid, content):
    realoid = node.hex(hashlib.sha256(content).digest())
    if realoid != oid:
        raise LfsCorruptionError(_(b'detected corrupt lfs object: %s') % oid,
                                 hint=_(b'run hg verify'))

def remote(repo, remote=None):
    """remotestore factory. return a store in _storemap depending on config

    If ``lfs.url`` is specified, use that remote endpoint.  Otherwise, try to

    scheme = url.scheme
    if scheme not in _storemap:
        raise error.Abort(_(b'lfs: unknown url scheme: %s') % scheme)
    return _storemap[scheme](repo, url)

class LfsRemoteError(error.StorageError):
    pass

class LfsCorruptionError(error.Abort):
    """Raised when a corrupt blob is detected, aborting an operation

    It exists to allow specialized handling on the server side."""

43076:2372284d9457

    util,
    vfs as vfsmod,
    worker,
)

from mercurial.utils import stringutil

from ..largefiles import lfutil

# 64 bytes for SHA256
_lfsre = re.compile(br'\A[a-f0-9]{64}\Z')


class lfsvfs(vfsmod.vfs):
    def join(self, path):
        """split the path at first two characters, like: XX/XXXXX..."""
        if not _lfsre.match(path):

        # when dirpath == root, dirpath[prefixlen:] becomes empty
        # because len(dirpath) < prefixlen.
        prefixlen = len(pathutil.normasprefix(root))
        oids = []

        for dirpath, dirs, files in os.walk(
            self.reljoin(self.base, path or b''), onerror=onerror
        ):
            dirpath = dirpath[prefixlen:]

            # Silently skip unexpected files and directories
            if len(dirpath) == 2:
                oids.extend(
                    [dirpath + f for f in files if _lfsre.match(dirpath + f)]
                )

        yield ('', [], oids)


class nullvfs(lfsvfs):
    def __init__(self):
        pass

    def read(self, oid):
        # store.read() calls into here if the blob doesn't exist in its
        # self.vfs.  Raise the same error as a normal vfs when asked to read a
        # file that doesn't exist.  The only difference is the full file path
        # isn't available in the error.
        raise IOError(
            errno.ENOENT,
            pycompat.sysstr(b'%s: No such file or directory' % oid),
        )

    def walk(self, path=None, onerror=None):
        return (b'', [], [])

    def write(self, oid, data):
        pass


class filewithprogress(object):
    """a file-like object that supports __len__ and read.

    Useful to provide progress information for how many bytes are read.
    """

    def __init__(self, fp, callback):
        self._fp = fp
        self._callback = callback  # func(readsize)
        fp.seek(0, os.SEEK_END)
        self._len = fp.tell()
        fp.seek(0)

    def __len__(self):

        else:
            self._fp.close()
            self._fp = None
        return data


class local(object):
    """Local blobstore for large file contents.

    This blobstore is used both as a cache and as a staging area for large blobs
    to be uploaded to the remote blobstore.

                fp.write(chunk)
                sha256.update(chunk)

            realoid = node.hex(sha256.digest())
            if realoid != oid:
                raise LfsCorruptionError(
                    _(b'corrupt remote lfs object: %s') % oid
                )

        self._linktousercache(oid)

    def write(self, oid, data):
        """Write blob to local blobstore.

        upload the blob, to ensure it is always available in this store.
        Normally this is done implicitly when the client reads or writes the
        blob, but that doesn't happen when the server tells the client that it
        already has the blob.
        """
        if not isinstance(self.cachevfs, nullvfs) and not self.vfs.exists(oid):
            self.ui.note(_(b'lfs: found %s in the usercache\n') % oid)
            lfutil.link(self.cachevfs.join(oid), self.vfs.join(oid))

    def _linktousercache(self, oid):
        # XXX: should we verify the content of the cache, and hardlink back to
        # the local store on success, but truncate, write and link on failure?
        if not self.cachevfs.exists(oid) and not isinstance(
            self.cachevfs, nullvfs
        ):
            self.ui.note(_(b'lfs: adding %s to the usercache\n') % oid)
            lfutil.link(self.vfs.join(oid), self.cachevfs.join(oid))

    def read(self, oid, verify=True):
        """Read blob from local blobstore."""

    def has(self, oid):
        """Returns True if the local blobstore contains the requested blob,
        False otherwise."""
        return self.cachevfs.exists(oid) or self.vfs.exists(oid)


def _urlerrorreason(urlerror):
    '''Create a friendly message for the given URLError to be used in an
    LfsRemoteError message.
    '''
    inst = urlerror

    if isinstance(urlerror.reason, Exception):
        inst = urlerror.reason

    if util.safehasattr(inst, 'reason'):
        try:  # usually it is in the form (errno, strerror)
            reason = inst.reason.args[1]
        except (AttributeError, IndexError):
            # it might be anything, for example a string
            reason = inst.reason
        if isinstance(reason, pycompat.unicode):

    elif getattr(inst, "strerror", None):
        return encoding.strtolocal(inst.strerror)
    else:
        return stringutil.forcebytestr(urlerror)


class lfsauthhandler(util.urlreq.basehandler):
    handler_order = 480  # Before HTTPDigestAuthHandler (== 490)

    def http_error_401(self, req, fp, code, msg, headers):
        """Enforces that any authentication performed is HTTP Basic

        if authreq:
            scheme = authreq.split()[0]

            if scheme.lower() != r'basic':
                msg = _(b'the server must support Basic Authentication')
                raise util.urlerr.httperror(
                    req.get_full_url(),
                    code,
                    encoding.strfromlocal(msg),
                    headers,
                    fp,
                )
        return None


class _gitlfsremote(object):
    def __init__(self, repo, url):
        ui = repo.ui
        self.ui = ui
        baseurl, authinfo = url.authinfo()
        self.baseurl = baseurl.rstrip(b'/')

        """Get metadata about objects pointed by pointers for given action

        Return decoded JSON object like {'objects': [{'oid': '', 'size': 1}]}
        See https://github.com/git-lfs/git-lfs/blob/master/docs/api/batch.md
        """
        objects = [
            {r'oid': pycompat.strurl(p.oid()), r'size': p.size()}
            for p in pointers
        ]
        requestdata = pycompat.bytesurl(
            json.dumps(
                {r'objects': objects, r'operation': pycompat.strurl(action),}
            )
        )
        url = b'%s/objects/batch' % self.baseurl
        batchreq = util.urlreq.request(pycompat.strurl(url), data=requestdata)
        batchreq.add_header(r'Accept', r'application/vnd.git-lfs+json')
        batchreq.add_header(r'Content-Type', r'application/vnd.git-lfs+json')
        try:
            with contextlib.closing(self.urlopener.open(batchreq)) as rsp:
                rawjson = rsp.read()
        except util.urlerr.httperror as ex:
            hints = {
                400: _(
                    b'check that lfs serving is enabled on %s and "%s" is '
                    b'supported'
                )
                % (self.baseurl, action),
                404: _(b'the "lfs.url" config may be used to override %s')
                % self.baseurl,
            }
            hint = hints.get(ex.code, _(b'api=%s, action=%s') % (url, action))
            raise LfsRemoteError(
                _(b'LFS HTTP error: %s') % stringutil.forcebytestr(ex),
                hint=hint,
            )
        except util.urlerr.urlerror as ex:
            hint = (
                _(b'the "lfs.url" config may be used to override %s')
                % self.baseurl
            )
            raise LfsRemoteError(
                _(b'LFS error: %s') % _urlerrorreason(ex), hint=hint
            )
        try:
            response = json.loads(rawjson)
        except ValueError:
            raise LfsRemoteError(
                _(b'LFS server returns invalid JSON: %s')
                % rawjson.encode("utf-8")
            )

        if self.ui.debugflag:
            self.ui.debug(b'Status: %d\n' % rsp.status)
            # lfs-test-server and hg serve return headers in different order
            headers = pycompat.bytestr(rsp.info()).strip()
            self.ui.debug(b'%s\n' % b'\n'.join(sorted(headers.splitlines())))

            if r'objects' in response:
                response[r'objects'] = sorted(
                    response[r'objects'], key=lambda p: p[r'oid']
                )
            self.ui.debug(
                b'%s\n'
                % pycompat.bytesurl(
                    json.dumps(
                        response,
                        indent=2,
                        separators=(r'', r': '),
                        sort_keys=True,
                    )
                )
            )

        def encodestr(x):
            if isinstance(x, pycompat.unicode):
                return x.encode(u'utf-8')
            return x

            # The server should return 404 when objects cannot be found. Some
            # server implementation (ex. lfs-test-server)  does not set "error"
            # but just removes "download" from "actions". Treat that case
            # as the same as 404 error.
            if b'error' not in response:
                if action == b'download' and action not in response.get(
                    b'actions', []
                ):
                    code = 404
                else:
                    continue
            else:
                # An error dict without a code doesn't make much sense, so

                    410: b'The object was removed by the owner',
                    422: b'Validation error',
                    500: b'Internal server error',
                }
                msg = errors.get(code, b'status code %d' % code)
                raise LfsRemoteError(
                    _(b'LFS server error for "%s": %s') % (filename, msg)
                )
            else:
                raise LfsRemoteError(
                    _(b'LFS server error. Unsolicited response for oid %s')
                    % response[b'oid']
                )

    def _extractobjects(self, response, pointers, action):
        """extract objects from response of the batch API

        response: parsed JSON object returned by batch API

        objects = response.get(b'objects', [])
        self._checkforservererror(pointers, objects, action)

        # Filter objects with given action. Practically, this skips uploading
        # objects which exist in the server.
        filteredobjects = [
            o for o in objects if action in o.get(b'actions', [])
        ]

        return filteredobjects

    def _basictransfer(self, obj, action, localstore):
        """Download or upload a single object using basic transfer protocol

        request = util.urlreq.request(pycompat.strurl(href))
        if action == b'upload':
            # If uploading blobs, read data from local blobstore.
            if not localstore.verify(oid):
                raise error.Abort(
                    _(b'detected corrupt lfs object: %s') % oid,
                    hint=_(b'run hg verify'),
                )
            request.data = filewithprogress(localstore.open(oid), None)
            request.get_method = lambda: r'PUT'
            request.add_header(r'Content-Type', r'application/octet-stream')
            request.add_header(r'Content-Length', len(request.data))

                if self.ui.debugflag:
                    ui.debug(b'Status: %d\n' % req.status)
                    # lfs-test-server and hg serve return headers in different
                    # order
                    headers = pycompat.bytestr(req.info()).strip()
                    ui.debug(b'%s\n' % b'\n'.join(sorted(headers.splitlines())))

                if action == b'download':
                    # If downloading blobs, store downloaded data to local
                    # blobstore
                    localstore.download(oid, req)

                        response += data
                    if response:
                        ui.debug(b'lfs %s response: %s' % (action, response))
        except util.urlerr.httperror as ex:
            if self.ui.debugflag:
                self.ui.debug(
                    b'%s: %s\n' % (oid, ex.read())
                )  # XXX: also bytes?
            raise LfsRemoteError(
                _(b'LFS HTTP error: %s (oid=%s, action=%s)')
                % (stringutil.forcebytestr(ex), oid, action)
            )
        except util.urlerr.urlerror as ex:
            hint = _(b'attempted connection to %s') % pycompat.bytesurl(
                util.urllibcompat.getfullurl(request)
            )
            raise LfsRemoteError(
                _(b'LFS error: %s') % _urlerrorreason(ex), hint=hint
            )

    def _batch(self, pointers, localstore, action):
        if action not in [b'upload', b'download']:
            raise error.ProgrammingError(b'invalid Git-LFS action: %s' % action)

        objects = self._extractobjects(response, pointers, action)
        total = sum(x.get(b'size', 0) for x in objects)
        sizes = {}
        for obj in objects:
            sizes[obj.get(b'oid')] = obj.get(b'size', 0)
        topic = {
            b'upload': _(b'lfs uploading'),
            b'download': _(b'lfs downloading'),
        }[action]
        if len(objects) > 1:
            self.ui.note(
                _(b'lfs: need to transfer %d objects (%s)\n')
                % (len(objects), util.bytecount(total))
            )

        def transfer(chunk):
            for obj in chunk:
                objsize = obj.get(b'size', 0)
                if self.ui.verbose:
                    if action == b'download':
                        msg = _(b'lfs: downloading %s (%s)\n')
                    elif action == b'upload':
                        msg = _(b'lfs: uploading %s (%s)\n')
                    self.ui.note(
                        msg % (obj.get(b'oid'), util.bytecount(objsize))
                    )
                retry = self.retry
                while True:
                    try:
                        self._basictransfer(obj, action, localstore)
                        yield 1, obj.get(b'oid')
                        break
                    except socket.error as ex:
                        if retry > 0:
                            self.ui.note(
                                _(b'lfs: failed: %r (remaining retry %d)\n')
                                % (stringutil.forcebytestr(ex), retry)
                            )
                            retry -= 1
                            continue
                        raise

        # Until https multiplexing gets sorted out
        if self.ui.configbool(b'experimental', b'lfs.worker-enable'):
            oids = worker.worker(
                self.ui,
                0.1,
                transfer,
                (),
                sorted(objects, key=lambda o: o.get(b'oid')),
            )
        else:
            oids = transfer(sorted(objects, key=lambda o: o.get(b'oid')))

        with self.ui.makeprogress(topic, total=total) as progress:
            progress.update(0)

                progress.update(processed)
                self.ui.note(_(b'lfs: processed: %s\n') % oid)

        if blobs > 0:
            if action == b'upload':
                self.ui.status(
                    _(b'lfs: uploaded %d files (%s)\n')
                    % (blobs, util.bytecount(processed))
                )
            elif action == b'download':
                self.ui.status(
                    _(b'lfs: downloaded %d files (%s)\n')
                    % (blobs, util.bytecount(processed))
                )

    def __del__(self):
        # copied from mercurial/httppeer.py
        urlopener = getattr(self, 'urlopener', None)
        if urlopener:
            for h in urlopener.handlers:
                h.close()
                getattr(h, "close_all", lambda: None)()


class _dummyremote(object):
    """Dummy store storing blobs to temp directory."""

    def __init__(self, repo, url):

    def readbatch(self, pointers, tostore):
        for p in _deduplicate(pointers):
            with self.vfs(p.oid(), b'rb') as fp:
                tostore.download(p.oid(), fp)


class _nullremote(object):
    """Null store storing blobs to /dev/null."""

    def __init__(self, repo, url):
        pass

        pass

    def readbatch(self, pointers, tostore):
        pass


class _promptremote(object):
    """Prompt user to set lfs.url when accessed."""

    def __init__(self, repo, url):
        pass

    def readbatch(self, pointers, tostore, ui=None):
        self._prompt()

    def _prompt(self):
        raise error.Abort(_(b'lfs.url needs to be configured'))


_storemap = {
    b'https': _gitlfsremote,
    b'http': _gitlfsremote,
    b'file': _dummyremote,
    b'null': _nullremote,
    None: _promptremote,
}


def _deduplicate(pointers):
    """Remove any duplicate oids that exist in the list"""
    reduced = util.sortdict()
    for p in pointers:
        reduced[p.oid()] = p
    return reduced.values()


def _verify(oid, content):
    realoid = node.hex(hashlib.sha256(content).digest())
    if realoid != oid:
        raise LfsCorruptionError(
            _(b'detected corrupt lfs object: %s') % oid,
            hint=_(b'run hg verify'),
        )


def remote(repo, remote=None):
    """remotestore factory. return a store in _storemap depending on config

    If ``lfs.url`` is specified, use that remote endpoint.  Otherwise, try to

    scheme = url.scheme
    if scheme not in _storemap:
        raise error.Abort(_(b'lfs: unknown url scheme: %s') % scheme)
    return _storemap[scheme](repo, url)


class LfsRemoteError(error.StorageError):
    pass


class LfsCorruptionError(error.Abort):
    """Raised when a corrupt blob is detected, aborting an operation

    It exists to allow specialized handling on the server side."""